tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle
7 * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
8 */
9#ifndef _ASM_IRQ_H
10#define _ASM_IRQ_H
11
12#include <linux/linkage.h>
13
14#include <asm/mipsmtregs.h>
15
16#include <irq.h>
17
18#ifdef CONFIG_I8259
19static inline int irq_canonicalize(int irq)
20{
21 return ((irq == 2) ? 9 : irq);
22}
23#else
24#define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
25#endif
26
27struct pt_regs;
28
29extern asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs);
30
31#ifdef CONFIG_MIPS_MT_SMTC
32/*
33 * Clear interrupt mask handling "backstop" if irq_hwmask
34 * entry so indicates. This implies that the ack() or end()
35 * functions will take over re-enabling the low-level mask.
36 * Otherwise it will be done on return from exception.
37 */
38#define __DO_IRQ_SMTC_HOOK() \
39do { \
40 if (irq_hwmask[irq] & 0x0000ff00) \
41 write_c0_tccontext(read_c0_tccontext() & \
42 ~(irq_hwmask[irq] & 0x0000ff00)); \
43} while (0)
44#else
45#define __DO_IRQ_SMTC_HOOK() do { } while (0)
46#endif
47
48#ifdef CONFIG_PREEMPT
49
50/*
51 * do_IRQ handles all normal device IRQ's (the special
52 * SMP cross-CPU interrupts have their own specific
53 * handlers).
54 *
55 * Ideally there should be away to get this into kernel/irq/handle.c to
56 * avoid the overhead of a call for just a tiny function ...
57 */
58#define do_IRQ(irq, regs) \
59do { \
60 irq_enter(); \
61 __DO_IRQ_SMTC_HOOK(); \
62 __do_IRQ((irq), (regs)); \
63 irq_exit(); \
64} while (0)
65
66#endif
67
68extern void arch_init_irq(void);
69extern void spurious_interrupt(struct pt_regs *regs);
70
71#ifdef CONFIG_MIPS_MT_SMTC
72struct irqaction;
73
74extern unsigned long irq_hwmask[];
75extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
76 unsigned long hwmask);
77#endif /* CONFIG_MIPS_MT_SMTC */
78
79#ifdef CONFIG_SMP
80#define ARCH_HAS_IRQ_PER_CPU
81#endif
82
83#endif /* _ASM_IRQ_H */